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Variable Valve Timing Solenoid Replacement
 
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Pelican Technical Article:

Variable Valve Timing Solenoid Replacement

Jared Fenton

Time:

2 hours2 hrs

Tab:

$100 to $200

Talent:

***

Tools:

Flathead screwdriver, T25 Torx driver, penetrant spray

Applicable Models:

Volvo C30 T5 (2008-13)
Volvo C30 T5 R-Design (2008-13)

Parts Required:

Variable valve timing solenoid

Hot Tip:

Spray a little penetrant oil around the solenoid to help removal

Performance Gain:

Better power and MPG

Complementary Modification:

Replace spark plugs

The Volvo C30 uses variable valve timing (VVT) to help both increase power and also improve fuel economy. It does this by altering the position of the camshafts in relation to the normal camshaft timing. This allows the engine to adjust the timing within a specified range. This is done by two electric solenoids mounted in the valve cover.

Typically, a bad solenoid will trigger a fault code, pointing to which solenoid has the problem, either intake or exhaust. I recommend using the factory VADIS software package or an aftermarket scanner to read the codes and determine which one is faulty.

Replacing the solenoids is relatively easy. You first need to remove the upper intake pipe and the left cylinder head cover. See our article on Spark Plug and Coil Pack Replacement for more information.

The solenoids are held in place with a single T25 Torx screw. You'll need to remove this and also unplug the electrical connection. Removing the solenoids can be a little tricky as they will likely be stuck. I recommend spraying some penetrant oil around the base of each solenoid to free them up. Simply pull them up and out of the mounting bore once free.

Shown here are the two VVT solenoids on the engine.
Figure 1

Shown here are the two VVT solenoids on the engine. Keep in mind that the intake (yellow arrow) and the exhaust (blue arrow) solenoids are different and cannot be interchanged. Loosen and remove the two T25 Torx screws (green arrows)

Press the tabs (green arrows) on the electrical connectors going to each VVT solenoid and pull them off.
Figure 2

Press the tabs (green arrows) on the electrical connectors going to each VVT solenoid and pull them off. Also spray some penetrant oil around the base of each solenoid (yellow arrow) to help when pulling them out.

Shown here is the intake VVT solenoid removed from the engine.
Figure 3

Shown here is the intake VVT solenoid removed from the engine. Be sure to clean the mounting bore and lightly lubricate it with engine oil before installing the new one. Also make sure that the new solenoids are completely seated in the bore. Installation is the reverse of removal.

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Comments and Suggestions:
Caseodilla Comments: I tried to replace both my intake and exhaust vvt solenoids yesterday. Everything was going along perfectly until it was time to remove the old ones. I got both of them out, but the sleeve with the two o rings remained stuck in the mounting bore in cam/valve cover. I had no idea that they were two pieces.The solenoids came out with the inner filter element exposed. I was not able to install the new ones as I could not get those sleeves out. My question is, has anyone else had this problem before, and am I going to have to remove the entire cam/valve cover to get the sleeves out?
February 20, 2017
  Followup from the Pelican Staff: You should be able to carefully pull them from the head using a small pick tool with a 90 degree end on it. Be very careful not to scratch the internal bore of the cylinder head with the pick tool! - Casey at Pelican Parts  
E Comments: Im getting no power to vvt intake solenoid plug also blowing a 15a fues now and again for engine management took ohm. At plug its at .01ohm and visual inspect the harness looks ok engine light on for intake valve solenoid bank one. Why my fuse blowing and no power to plug?
January 16, 2017
  Followup from the Pelican Staff: Unplug the components on the fuse, if the fuse still blows the wiring harness is shorted. At that point I would run a new wire rather than search for the short. - Nick at Pelican Parts  

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Page last updated: Sun 2/26/2017 02:39:13 AM